SeaTac, WA Profile: Facts & Data


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SeaTac, Washington - Basic Facts

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The City of SeaTac had a population of 31,926 as of July 1, 2022. SeaTac ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Washington. See peer rankings below.

The primary coordinate point for SeaTac is located at latitude 47.4537 and longitude -122.3218 in King County. The formal boundaries for the City of SeaTac encompass a land area of 10.03 sq. miles and a water area of 0.17 sq. miles. King County is in the Pacific time zone (GMT -8). The elevation is 269 feet.

The City of SeaTac has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

Washington is one of 20 states where Census County Divisions (CCDs) are used for statistical tracking of subdivisions within each county. The City of SeaTac is located within Seattle Division of King County.

Jump to... (On This Page!)
  1. SeaTac 2022 Demographic Data
  2. Growth Rates for SeaTac (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. Washington Research Tools (Easy Tools & Current Data)
  3. Washington Data Comparison Tool - 2022 Demographics

SeaTac, WA Data & Demographics (As of July 1, 2022)


Total Population 31,926 (100%)
Population in Households 30,725 (96.2%)
Population in Families 23,861 (74.7%)
Population in Group Quarters1 1,201 ( 3.8%)
Population Density 3,172
Diversity Index2 85


Median Household Income $72,635
Average Household Income $99,834
% of Income for Mortgage4 30%
Per Capita Income $34,794
Wealth Index5 82


Total HU (Housing Units) 11,858 (100%)
Owner Occupied HU 5,476 (46.2%)
Renter Occupied HU 5,752 (48.5%)
Vacant Housing Units 631 ( 5.3%)
Median Home Value $407,659
Average Home Value $483,650
Housing Affordability Index3 85


Total Households 11,227
Average Household Size 2.74
Family Households 7,055
Average Family Size 3.00
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  2. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different races or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.


2020-2022 2022-2027
Population 0.66% 0.49%
Households 0.54% 0.36%
Families   0.55%
Median Household Income   3.41%
Per Capita Income   4.07%
Owner Occupied HU   0.52%

SeaTac, WA - Peer Comparisons by Rank and Percentile

The table below compares SeaTac to the other 639 incorporated cities, towns and CDPs in Washington by rank and percentile using July 1, 2022 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 44 93rd
Population Density # 84 87th
Median Household Income # 343 46th
Housing Affordability Index # 199 31st
Per Capita Income # 408 36th
Diversity Index # 4 100th

Additional comparisons and rankings can be made with a VERY EASY TO USE Washington Census Data Comparison Tool.

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